Do you have any vacuum gauges at all to test the pump? ( Though I doubt that is the problem based upon your tests )
After the 3rd cycle I had hit my 20 cycle oil limit so it was time to change the oil. This time I took the time to add a flush port to my pump. When I replaced the plumbing with larger diameter brass and a cutoff valve I did not think to add the oil flush out port.
We have to face one hard fact when shopping for home freeze dryers. That fact is, unlike many other purchases, freeze dryers aren't cheap. However, unlike many other purchases, a freeze dryer can provide a lifetime of cost savings that ultimately pay for itself.
Many times, you can still freeze dry something if you mix it in. For instance, if there’s a meal that has butter in it, it’s fine to freeze dry. It may just reduce the shelf life a little. So instead of 25 year shelf life, it might have a 10 year shelf life.
This includes setting as many as five different shelf temperatures, thus allowing the material to dry in phases, at different temperatures. For instance, you might have the material begin drying at 10ºF and increase the temperature in phases until the ultimate final dry temperature is 70ºF.
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We also like to freeze dry gluten-free sweet breads and muffins. Slice bread or muffins and freeze dry it. Then to reconstitute, simply wrap it in a wet paper towel and leave it in the fridge overnight or put it in the microwave for up to 30 seconds.
So I corrected the oversight - I drilled and tapped the elbow to add the port. Here is a picture. It worked great today when I flushed the pump to clear out the gunk.
Drying things out played a roll as well as the added insulation. We had 3.5 weeks of constant rain here in central NC more info with humidity over 95% and temps near 95F in the beginning and tapering down to 80F by the end of the rain. The condensation on the front panel around the seal had water running down the front of the Freeze Dryer constantly during the entire cycle, not just the freeze cycle. I initially went into the FDer to simply stop the humdity from reaching the outer chamber shell and freezing.
“Astronaut” ice cream is a fun treat to make and is so easy. Just scoop ice cream onto the trays and freeze before processing.
Their production needs can be met by investing in expertly freeze-drying machinery offered by trusted pharma machinery manufacturers. Such companies benefit the most from the continuous improvement of freeze-drying technology, allowing them to gain enduring success.
The only way I know to filter the water vapor out would be a cold trap. They usually use liquid nitrogen or dry ice to keep the temperature low enough that all the water condenses out. Obviously you would need a supply of the liquid nitrogen or dry ice that would probably not be cost effective for most of us. The other option to get that cold would be to use a cryocooler and build a cold trap around it. It could be done, but would be pretty expensive. I've been watching some electronics on ebay that have cryocoolers in them, but the cheapest I've seen is around $600. Still not a cheap option, but you wouldn't need dry ice or liquid nitrogen to feed it.
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Freeze dried Skittles are a favorite in my family. They end up with a crunchy texture. Other candies have a crunchy exterior and an airy interior.